CN101906518B - Post-forging heat treatment process for nickeliferous dilute alloy round steel - Google Patents
Post-forging heat treatment process for nickeliferous dilute alloy round steel Download PDFInfo
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- CN101906518B CN101906518B CN2010102583035A CN201010258303A CN101906518B CN 101906518 B CN101906518 B CN 101906518B CN 2010102583035 A CN2010102583035 A CN 2010102583035A CN 201010258303 A CN201010258303 A CN 201010258303A CN 101906518 B CN101906518 B CN 101906518B
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Abstract
The invention discloses a post-forging heat treatment process for nickeliferous dilute alloy round steel, which can enables the hydrogen in a forged piece to fully spread and escape out and comprises the following steps: 1) carrying out air cooling on the surface of the forged piece until the temperature thereof is 300-350 DEG C; 2) utilizing normalizing to heat the forged piece until the temperature thereof is 650 DEG C, carrying out heat preservation for a while, then heating the forged piece until the temperature thereof is 840-860 DEG C, and carrying out heat preservation for a while; 3) lifting out the forged piece, simultaneously carrying out air cooling and fog cooling, rapidly cooling the forged piece until the temperature thereof is 280-350 DEG C; 4) putting the forged piece into a furnace for heat preservation, keeping the temperature of the forged piece to be 280-350 DEG C; 5) heating the forged piece until the temperature thereof is 650-670 DEG C, carrying out heat preservation for a while, and then carrying out temperature equilibrium for 3-5h; and 6) embedding the forge piece into a sand pit with the sand thickness of 20-30mm for heat preservation for 3-5 days, enabling the hydrogen to further spread, and controlling the temperature of the forged piece which is taken away from the sand to be 100-150 DEG C. The post-forging heat treatment process of the invention can enable the hydrogen in the forge piece to fully spread and escape out, thereby eliminating the potential safety hazard of hydrogen embrittlement fracture of the forged piece and improving the quality of the forged piece.
Description
Technical field
The present invention relates to and forge postheat treatment technology, refer more particularly to the forging postheat treatment technology of nickeliferous low-alloy round steel.
Background technology
In the production process of forging, forge the forging of moulding, its inner crystal grain is thick, stress is bigger, and hydrogen content is bigger, need come crystal grain thinning, eliminates stress and expand hydrogen etc. by forging postheat treatment, makes that its interior tissue obtains effectively becoming.Present forging postheat treatment technology, the hydrogen in the forging fully not being spread effusion, promptly to expand hydrogen not thorough, makes that its inner hydrogen richness exceeds standard through forging the forging of postheat treatment, and this forging exists the potential safety hazard of hydrogen embrittlement fracture in actual use.
Summary of the invention
Technical problem to be solved by this invention is: a kind of forging postheat treatment technology that the hydrogen in the forging fully can be spread the nickeliferous low-alloy round steel of effusion is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is: the forging postheat treatment technology of nickeliferous low-alloy round steel the steps include:
1) between surface temperature air cooling to 300 ~ 350 of the forging after will forging ℃;
2) with normalizing it is heated, with 90 ~ 100 ℃/hour heat-up rates the surface of forging is heated to 650 ℃, then, insulation for some time, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range; Then, be elevated between 840 ~ 860 ℃ according to the temperature of 60 ~ 80 ℃/hour heat-up rates with the forging surface, insulation for some time, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range;
3) forging is hung out, it is cold to carry out air-cooled and mist simultaneously, makes its surperficial temperature be cooled to 280 ~ 350 ℃ within 10 minutes;
4) advance the stove insulation, make the surface of forging maintain 280 ~ 350 ℃, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range;
5) with 60 ~ 80 ℃/hour heat-up rate tempering heating, the surface temperature of its forging is increased between 650 ~ 670 ℃, insulation for some time, soaking time obtains by the diameter ÷ 25.4 * 1.5 of described round steel, all in controlled range, then, samming is 3 ~ 5 hours again for deviation ± 12%;
6) forging is imbedded husky thick be to be incubated in 20 ~ 30 millimeters the sand pit, hydrogen is further spread, soaking time is 3 ~ 5 days, the sand temperature of control forging is between 100 ~ 150 ℃;
When calculating soaking time, the unit of the diameter of described round steel be a millimeter, and the unit of the soaking time that calculates is hour.
The invention has the beneficial effects as follows: forging postheat treatment technology of the present invention, not only can eliminate internal stress, the refinement crystallization of forging well, but also the hydrogen in the forging fully can be spread effusion, thus eliminated the potential safety hazard of forging hydrogen embrittlement fracture, improved the quality of forging.
Embodiment
Be that the forging postheat treatment technology of 600 millimeters nickeliferous low-alloy round steel is example with diameter below, describe specific embodiments of the present invention in detail.
Embodiment one:
1) the surface temperature air cooling to 300 of the forging after will forging ℃;
2) with normalizing it is heated, the surface temperature of forging is heated to 650 ℃, be incubated 11 hours with 90 ℃/hour heat-up rates; Then, be elevated between 860 ℃, be incubated 11 hours according to the temperature of 60 ℃/hour heat-up rates with the forging surface;
3) forging is hung out, it is cold to carry out air-cooled and mist simultaneously, makes its surperficial temperature be cooled to 350 ℃ within 10 minutes;
4) advance the stove insulation, make the surface of forging maintain 350 ℃, be incubated 11 hours;
5) with 60 ℃/hour heat-up rate tempering heating, the surface temperature of its forging is increased to 670 ℃, is incubated 32 hours, and then, samming is 3 hours again;
6) forging is imbedded husky thick be to be incubated in 20 millimeters the sand pit, hydrogen is further spread, soaking time is 3 days, the sand temperature of control forging is 100 ℃;
Embodiment two:
1) the surface temperature air cooling to 330 of the forging after will forging ℃;
2) with normalizing it is heated, the surface temperature of forging is heated to 650 ℃, be incubated 12 hours with 95 ℃/hour heat-up rates; Then, be elevated between 850 ℃, be incubated 12 hours according to the temperature of 70 ℃/hour heat-up rates with the forging surface;
3) forging is hung out, it is cold to carry out air-cooled and mist simultaneously, makes its surperficial temperature be cooled to 315 ℃ within 10 minutes;
4) advance the stove insulation, make the surface of forging maintain 315 ℃, be incubated 12 hours;
5) with 70 ℃/hour heat-up rate tempering heating, the surface temperature of its forging is increased to 660 ℃, is incubated 35 hours, and then, samming is 4 hours again;
6) forging is imbedded husky thick be to be incubated in 25 millimeters the sand pit, hydrogen is further spread, soaking time is 4 days, the sand temperature of control forging is 130 ℃;
Embodiment three:
1) the surface temperature air cooling to 350 of the forging after will forging ℃;
2) with normalizing it is heated, the surface temperature of forging is heated to 650 ℃, be incubated 13 hours with 100 ℃/hour heat-up rates; Then, be elevated between 840 ℃, be incubated 13 hours according to the temperature of 80 ℃/hour heat-up rates with the forging surface;
3) forging is hung out, it is cold to carry out air-cooled and mist simultaneously, makes its surperficial temperature be cooled to 280 ℃ within 10 minutes;
4) advance the stove insulation, make the surface of forging maintain 280 ℃, be incubated 13 hours;
5) with 80 ℃/hour heat-up rate tempering heating, the surface temperature of its forging is increased to 650 ℃, is incubated 39 hours, and then, samming is 5 hours again;
6) forging is imbedded husky thick be to be incubated in 30 millimeters the sand pit, hydrogen is further spread, soaking time is 5 days, the sand temperature of control forging is 150 ℃.
Claims (1)
1. the forging postheat treatment technology of nickeliferous low-alloy round steel the steps include:
1) between surface temperature air cooling to 300 ~ 350 of the forging after will forging ℃;
2) with normalizing it is heated, with 90 ~ 100 ℃/hour heat-up rates the surface of forging is heated to 650 ℃, then, insulation for some time, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range; Then, be elevated between 840 ~ 860 ℃ according to the temperature of 60 ~ 80 ℃/hour heat-up rates with the forging surface, insulation for some time, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range;
3) forging is hung out, it is cold to carry out air-cooled and mist simultaneously, makes its surperficial temperature be cooled to 280 ~ 350 ℃ within 10 minutes;
4) advance the stove insulation, make the surface of forging maintain 280 ~ 350 ℃, soaking time obtains by the diameter ÷ 50.8 of described round steel, and deviation ± 12% is all in controlled range;
5) with 60 ~ 80 ℃/hour heat-up rate tempering heating, the surface temperature of its forging is increased between 650 ~ 670 ℃, insulation for some time, soaking time obtains by the diameter ÷ 25.4 * 1.5 of described round steel, all in controlled range, then, samming is 3 ~ 5 hours again for deviation ± 12%;
6) forging is imbedded husky thick be to be incubated in 20 ~ 30 millimeters the sand pit, hydrogen is further spread, soaking time is 3 ~ 5 days, the sand temperature of control forging is between 100 ~ 150 ℃;
When calculating soaking time, the unit of the diameter of described round steel be a millimeter, and the unit of the soaking time that calculates is hour.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102583035A CN101906518B (en) | 2010-08-20 | 2010-08-20 | Post-forging heat treatment process for nickeliferous dilute alloy round steel |
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| CN2010102583035A CN101906518B (en) | 2010-08-20 | 2010-08-20 | Post-forging heat treatment process for nickeliferous dilute alloy round steel |
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| CN101906518B true CN101906518B (en) | 2011-09-14 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102776338A (en) * | 2012-07-16 | 2012-11-14 | 张家港海锅重型锻件有限公司 | Strengthening and cooling process for large forging normalizing |
| CN105838855B (en) * | 2016-05-27 | 2018-01-19 | 中原特钢股份有限公司 | Expand hydrogen annealing process after a kind of forging of steel forgings containing Chrome high Nickel alloys |
| CN107557540B (en) * | 2017-10-30 | 2018-11-06 | 山东伊莱特重工股份有限公司 | A kind of cold normalizing method of control of A105 forging |
| CN111390100A (en) * | 2020-05-13 | 2020-07-10 | 上海长特锻造有限公司 | Forging process of inner star wheel |
| CN112538561B (en) * | 2020-11-19 | 2023-06-06 | 河南科技大学 | Periodic dehydrogenation annealing method for large forging |
| CN114350904A (en) * | 2021-12-31 | 2022-04-15 | 安徽省瑞杰锻造有限责任公司 | Normalizing heat treatment process for 30CrNi2MoVA forged piece |
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| CN101314202B (en) * | 2008-06-02 | 2010-04-21 | 江阴振宏重型锻造有限公司 | Method for producing wind-electricity principal axis by gathering stock full fibre upset forging |
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Inventor after: Gu Jincai Inventor after: Fan Cunxue Inventor after: Xu Weiming Inventor after: Chu Yao Inventor before: Fan Cunxue |
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Address after: 215613 Anqing Village, Fenghuang Town, Zhangjiagang City, Jiangsu Province Patentee after: Zhangjiagang general Limited by Share Ltd Address before: 215613 Anqing Village, Fenghuang Town, Zhangjiagang City, Jiangsu Province Patentee before: Zhangjiagang City Guangda Machinery Forging Co., Ltd. |
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